Developing device for an image forming apparatus

Electrophotography – Image formation – Development

Patent

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G03G 1508

Patent

active

056254415

ABSTRACT:
In an image forming apparatus, a developing device operable with toner or single component type developer has a hard first developing roller and a soft second developing roller. Fine magnetic N-S poles are formed on the periphery of the first roller. The second roller conveys the toner, electrostatically transferred thereto from the first roller, to an image carrier. The device frees a toner image from deterioration due to toner particles charged to a polarity opposite to an expected polarity. The toner forms a uniform thin layer on the first roller and is uniformly charged. Toner for use with this type of developing device is also disclosed.

REFERENCES:
patent: 5532804 (1996-02-01), Hirata et al.

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